type_traits: Add common_type.
2008-07-08 Chris Fairles <chris.fairles@gmail.com>
* include/std/type_traits: Add common_type.
* testsuite/20_util/common_type/requirements/
explicit_instantiation.cc: New.
* testsuite/20_util/common_type/requirements/
typedefs-1.cc: Likewise.
From-SVN: r137618
This commit is contained in:
Chris Fairles
Paolo Carlini
parent
5acba8a21a
commit
cfa9a96b64
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@ -1,3 +1,11 @@
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2008-07-08 Chris Fairles <chris.fairles@gmail.com>
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* include/std/type_traits: Add common_type.
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* testsuite/20_util/common_type/requirements/
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explicit_instantiation.cc: New.
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* testsuite/20_util/common_type/requirements/
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typedefs-1.cc: Likewise.
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2008-07-07 Paolo Carlini <paolo.carlini@oracle.com>
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* testsuite/lib/libstdc++.exp (check_v3_target_stdint): New.
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@ -551,6 +551,41 @@ namespace std
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// Integral, but don't define.
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template<>
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struct make_signed<bool>;
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template<typename... _Tp>
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struct common_type;
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template<typename _Tp>
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struct common_type<_Tp>
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{
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static_assert(sizeof(_Tp) > 0, "must be complete type");
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typedef _Tp type;
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};
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template<typename _Tp, typename _Up>
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class common_type<_Tp, _Up>
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{
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static_assert(sizeof(_Tp) > 0, "must be complete type");
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static_assert(sizeof(_Up) > 0, "must be complete type");
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static _Tp&& __t();
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static _Up&& __u();
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// HACK: Prevents optimization of ?: in the decltype
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// expression when the condition is the literal, "true".
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// See, PR36628.
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static bool __true_or_false();
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public:
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typedef decltype(__true_or_false() ? __t() : __u()) type;
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};
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template<typename _Tp, typename _Up, typename... _Vp>
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struct common_type<_Tp, _Up, _Vp...>
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{
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typedef typename
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common_type<typename common_type<_Tp, _Up>::type, _Vp...>::type type;
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};
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}
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#endif // __GXX_EXPERIMENTAL_CXX0X__
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@ -0,0 +1,46 @@
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// { dg-options "-std=gnu++0x" }
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// { dg-do compile }
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// Copyright (C) 2008 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 2, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING. If not, write to the Free
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// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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// USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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// NB: This file is for testing type_traits with NO OTHER INCLUDES.
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#include <type_traits>
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namespace std
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{
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typedef int test_type1;
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typedef int& test_type2;
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typedef double test_type3;
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typedef float test_type4;
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template struct common_type<test_type1>;
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template struct common_type<test_type1, test_type2>;
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template struct common_type<test_type1, test_type2, test_type3>;
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template struct common_type<test_type1, test_type2, test_type3, test_type4>;
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}
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@ -0,0 +1,118 @@
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// { dg-options "-std=gnu++0x" }
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//
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// Copyright (C) 2008 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 2, or (at your option)
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// any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING. If not, write to the Free
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// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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// USA.
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#include <type_traits>
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#include <testsuite_hooks.h>
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#define JOIN( X, Y ) DO_JOIN( X, Y )
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#define DO_JOIN( X, Y ) DO_JOIN2(X,Y)
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#define DO_JOIN2( X, Y ) X##Y
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#define COMMON_TYPE_TEST_1(type1, uid) \
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typedef common_type<type1>::type JOIN(test_t,uid); \
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VERIFY( (is_same<JOIN(test_t,uid), JOIN(test_t,uid)>::value) ); \
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typedef common_type<const type1>::type JOIN(test_t,JOIN(uid,c)); \
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VERIFY( (is_same<JOIN(test_t,JOIN(uid,c)), \
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JOIN(test_t,JOIN(uid,c))>::value) ); \
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typedef common_type<volatile type1>::type JOIN(test_t,JOIN(uid,v)); \
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VERIFY( (is_same<JOIN(test_t,JOIN(uid,v)), \
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JOIN(test_t,JOIN(uid,v))>::value) ); \
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typedef common_type<const volatile type1>::type JOIN(test_t,JOIN(uid,cv)); \
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VERIFY( (is_same<JOIN(test_t,JOIN(uid,cv)), \
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JOIN(test_t,JOIN(uid,cv))>::value) ); \
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typedef common_type<type1 &>::type JOIN(test_t,JOIN(uid,l)); \
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VERIFY( (is_same<JOIN(test_t,JOIN(uid,l)), \
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JOIN(test_t,JOIN(uid,l))>::value) ); \
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typedef common_type<const type1 &>::type JOIN(test_t,JOIN(uid,lc)); \
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VERIFY( (is_same<JOIN(test_t,JOIN(uid,lc)), \
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JOIN(test_t,JOIN(uid,lc))>::value) ); \
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typedef common_type<volatile type1 &>::type JOIN(test_t,JOIN(uid,lv)); \
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VERIFY( (is_same<JOIN(test_t,JOIN(uid,lv)), \
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JOIN(test_t,JOIN(uid,lv))>::value) ); \
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typedef common_type<const volatile type1 &>::type JOIN(test_t,JOIN(uid,lcv)); \
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VERIFY( (is_same<JOIN(test_t,JOIN(uid,lcv)), \
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JOIN(test_t,JOIN(uid,lcv))>::value) ); \
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typedef common_type<type1 &&>::type JOIN(test_t,JOIN(uid,r)); \
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VERIFY( (is_same<JOIN(test_t,JOIN(uid,r)), \
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JOIN(test_t,JOIN(uid,r))>::value) ); \
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typedef common_type<const type1 &&>::type JOIN(test_t,JOIN(uid,rc)); \
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VERIFY( (is_same<JOIN(test_t,JOIN(uid,rc)), \
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JOIN(test_t,JOIN(uid,rc))>::value) ); \
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typedef common_type<volatile type1 &&>::type JOIN(test_t,JOIN(uid,rv)); \
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VERIFY( (is_same<JOIN(test_t,JOIN(uid,rv)), \
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JOIN(test_t,JOIN(uid,rv))>::value) ); \
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typedef common_type<const volatile type1 &&>::type JOIN(test_t,JOIN(uid,rcv)); \
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VERIFY( (is_same<JOIN(test_t,JOIN(uid,rcv)), \
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JOIN(test_t,JOIN(uid,rcv))>::value) )
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struct A { };
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struct B : A { };
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void test01()
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{
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bool test __attribute__((unused)) = true;
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using std::common_type;
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using std::is_same;
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// Positive tests.
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COMMON_TYPE_TEST_1(int, 1);
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COMMON_TYPE_TEST_1(double, 2);
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COMMON_TYPE_TEST_1(A, 3);
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COMMON_TYPE_TEST_1(B, 4);
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}
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#define COMMON_TYPE_TEST_2_IMPL(type1, type2, type3, uid) \
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typedef common_type<type1, type2>::type JOIN(JOIN(test, uid),_t1); \
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typedef common_type<type2, type1>::type JOIN(JOIN(test, uid),_t2); \
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VERIFY( (is_same<JOIN(JOIN(test, uid),_t1), type3>::value) ); \
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VERIFY( (is_same<JOIN(JOIN(test, uid),_t2), type3>::value) )
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#define NO_CV
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#define COMMON_TYPE_TEST_2(cv_qual, type1, type2, type3, uid) \
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COMMON_TYPE_TEST_2_IMPL(cv_qual type1, type2, type3, uid); \
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COMMON_TYPE_TEST_2_IMPL(cv_qual type1 &, type2, type3, JOIN(uid,l)); \
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COMMON_TYPE_TEST_2_IMPL(cv_qual type1 &&, type2, type3, JOIN(uid,r))
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#define COMMON_TYPE_TEST_ALL_2(type1, type2, type3, uid) \
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COMMON_TYPE_TEST_2(NO_CV, type1, type2, type3, uid); \
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COMMON_TYPE_TEST_2(const, type1, type2, type3, uid); \
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COMMON_TYPE_TEST_2(volatile, type1, type2, type3, uid); \
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COMMON_TYPE_TEST_2(const volatile, type1, type2, type3, uid)
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void test02()
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{
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bool test __attribute__((unused)) = true;
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using std::common_type;
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using std::is_same;
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COMMON_TYPE_TEST_ALL_2(int, int, int, 1);
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COMMON_TYPE_TEST_ALL_2(int, double, double, 2);
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COMMON_TYPE_TEST_2(NO_CV, A, A, A, 3);
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COMMON_TYPE_TEST_2(const, A, A, const A, 4);
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COMMON_TYPE_TEST_2(NO_CV, B, A, A, 5);
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}
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int main()
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{
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test01();
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test02();
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return 0;
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}
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